20+ Dnata Interview Questions and Answers

Method references provide a more concise way to refer to methods by name instead of using lambda expressions.

• Method references can make code more readable and maintainable by reducing boilerplate code.

• They can be used to refer to static methods, instance methods, and constructors.

• Example: list.forEach(System.out::println) is equivalent to list.forEach(item -> System.out.println(item)).

Java program to capitalize first letter of each word in a given string

• Split the input string by space to get individual words

• Iterate through each word and capitalize the first letter

• Join the words back together to form the final capitalized string

The yield() method in threading is used to give up the CPU and allow other threads to run.

• Allows other threads to run by giving up the CPU temporarily

• Useful for preventing one thread from dominating the CPU

• Can be used to implement cooperative multitasking

Vertical scaling increases the capacity of a single server, while horizontal scaling adds more servers to distribute the load.

• Vertical scaling involves increasing the resources of a single server, such as CPU, RAM, or storage.

• Horizontal scaling involves adding more servers to distribute the load, often done through containerization or virtualization.

• Vertical scaling is limited by the capacity of a single server, while horizontal scaling allows for more flexibility and scalabi...read more

Escalation matrix defines the process for escalating production defects based on severity and impact.

• Escalation matrix typically includes levels of escalation, responsible parties at each level, and criteria for escalating defects.

• For example, a Level 1 escalation may involve the development team, while a Level 2 escalation may involve senior management.

• Criteria for escalation may include severity of the defect, impact on users or business operations, and potential solutions....read more

Yes, it is okay to give deliverables under pressure as long as quality is not compromised.

• Meeting deadlines is important in software development.

• Pressure can sometimes lead to increased focus and productivity.

• Communication with stakeholders about realistic timelines is key.

• Prioritizing tasks and managing time effectively can help in delivering under pressure.

Hash collision occurs when two different inputs produce the same hash value. It can be handled by using techniques like chaining or open addressing.

• Hash collision is a common issue in hash tables where different keys produce the same hash value.

• One way to handle hash collisions is by using chaining, where each bucket in the hash table stores a linked list of key-value pairs with the same hash value.

• Another way to handle hash collisions is through open addressing, where if a c...read more

Yes, I have the ability to handle tasks individually.

• I have a proven track record of successfully completing projects on my own.

• I am self-motivated and can prioritize tasks effectively.

• I have strong problem-solving skills which allow me to tackle challenges independently.

My current CTC is $100,000 and my expected CTC is $120,000.

• Current CTC: $100,000

• Expected CTC: $120,000

Classes in object-oriented programming are of four types: abstract, concrete, final, and static.

• Abstract classes cannot be instantiated and are used as base classes for other classes.

• Concrete classes can be instantiated and are used to create objects.

• Final classes cannot be inherited and are used to prevent further modification.

• Static classes cannot be instantiated and are used to group related methods and properties.

Snowflake is a cloud-based data warehousing platform that separates storage and compute, allowing for scalable and efficient data processing.

• Snowflake uses a unique architecture that separates storage and compute resources, enabling on-demand scaling for both without any manual intervention.

• It supports multiple data types and semi-structured data like JSON, Avro, Parquet, etc.

• Snowflake offers automatic optimization of queries through its query optimizer, reducing the need for...read more

Views in databases are virtual tables that display data from one or more tables.

• Views are created using SELECT statements.

• They can be used to simplify complex queries.

• Views can also be used to restrict access to sensitive data.

• Changes made to the underlying tables are reflected in the view.

• Examples of views include employee information, customer orders, and product inventory.

Use SQL query with window function to find third highest salary of an employee.

• Use ROW_NUMBER() function to assign a unique row number to each record based on salary in descending order

• Filter the result where row number is 3 to get the third highest salary

To find the average salary of employees in a particular department, calculate the total salary of all employees in that department and divide by the number of employees.

• Retrieve the salary of all employees in the particular department

• Calculate the total salary by summing up all individual salaries

• Divide the total salary by the number of employees to get the average salary

Remote Attribute is used in ASP.NET MVC to validate that a property value is valid when the property is posted to the server.

• Used in ASP.NET MVC for client-side validation

• Validates that a property value is valid when posted to the server

• Can be used to check if a property value is unique in the database

An interface is a contract between two components that defines the communication between them.

• It specifies the methods, properties, and events that a component exposes to the outside world.

• It hides the implementation details of a component and provides a standardized way to interact with it.

• It allows for loose coupling between components, enabling them to be developed and tested independently.

• Examples include APIs, GUIs, and network protocols.

Cursors are database objects used to manipulate data in a result set.

• Cursors are used to fetch and manipulate data row by row.

• They are commonly used in stored procedures and triggers.

• Cursors can be forward-only, static, dynamic, or keyset-driven.

• They can be used to update or delete data in a result set.

• However, they can be resource-intensive and should be used sparingly.

Domain Driven Design is an approach to software development that focuses on the core domain and domain logic.

• Focuses on understanding and modeling the core domain of the software

• Emphasizes collaboration between domain experts and developers

• Encourages the use of a common language to bridge the communication gap between technical and non-technical stakeholders

• Promotes the use of domain models to capture and express the complexity of the domain

• Helps in creating a flexible and ma...read more

Clustering is a technique used in data mining to group similar data points together based on certain criteria.

• Clustering is an unsupervised machine learning technique.

• It is used to discover hidden patterns or structures in data.

• Examples include K-means clustering, hierarchical clustering, and DBSCAN.

include() is a PHP function used to include and evaluate a specified file.

• include() is used to include and evaluate a specified file in PHP code.

• It is commonly used to include reusable code snippets or libraries.

• The included file is processed as if it were part of the calling file.

• If the file cannot be included, a warning is generated but the script will continue to execute.